Portable microscope



FIG. 1 is a side elevation view of a portable microscope showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a portable microscope, as shown. 